How to append CustomQWidget from a QVBoxLayout to QVector

[Emanuele Papa]

Hi!

I'm trying to get every CustomQWidget i added to the layout and insert them into a QVector so i can sort them.

void MainWindow::onFilenameClick()
{
    QVector<CustomQWidget*> qv;

    for(int i = 0; i < ui->widgets_layout->count(); i++) {
        QWidget *widget = ui->widgets_layout->itemAt(i)->widget();
        if(widget != nullptr) {
            qv.append(widget);
        }
    }
    std::sort(qv.begin(), qv.end(), _functor());
    update_ui(qv);
}

The problem is that i keep getting the error message

no matching member function for call to 'append'
candidate function not viable: cannot convert from base class pointer 'QWidget *' to derived class pointer 'CustomQLabel *const' for 1st argument
candidate function not viable: cannot convert from base class pointer 'QWidget *' to derived class pointer 'CustomQLabel *' for 1st argument
candidate function not viable: cannot convert from base class pointer 'QWidget *' to 'const QVector<CustomQWidget *>' for 1st argument

I've already tryed to static_cast the CustomQWidget to QWidget but nothing has changed.

qv.append(static_cast<QWidget*>(widget));

And I also tried with

qv.push_back(widget);
qv.insert(i, widget);

Here's the CustomQWidget.h

class CustomQWidget : public QWidget
{
  Q_OBJECT
public:
...
private:
  Ui::CustomQWidget *ui;
...
};

I really don't know what to do, please help me

[JonB]

@Emanuele-Papa
Since you have QVector<CustomQWidget*> qv you can only append a CustomQWidget* to qv vector. ui->widgets_layout->itemAt(i)->widget() only returns (any kind of) QWidget*. You need to check that the widget is a CustomQWidget*:

        CustomQWidget*customWidget = qobject_cast<CustomQWidget*>(ui->widgets_layout->itemAt(i)->widget());
        if(customWidget != nullptr) {
            qv.append(customWidget);
        }

[Emanuele Papa]

It worked! Thank you